TPS75125-EP [TI]
FAST TRANSIENT RESPONSE 15-A LOW DROPOUT VOLTAGE REGULATOR WITH POWER GOOD; 快速瞬态响应15 -A低压差具有电源状态良好稳压器
| 型号： | TPS75125-EP |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | FAST TRANSIENT RESPONSE 15-A LOW DROPOUT VOLTAGE REGULATOR WITH POWER GOOD |
| 文件： | 总24页 (文件大小：698K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TPS75125-EP
FAST TRANSIENT RESPONSE 15-A LOW DROPOUT VOLTAGE REGULATOR
WITH POWER GOOD
SGLS330B–MAY 2006–REVISED JUNE 2007
www.ti.com
FEATURES
•
Controlled Baseline
•
•
Fast Transient Response
–
One Assembly/Test Site, One Fabrication
Site
3% Tolerance Over Specified Conditions for
Fixed Output Version
•
•
Extended Temperature Performance of –55°C
to 125°C
•
•
20 Pin TSSOP (PWP) PowerPAD™ Package
Thermal Shutdown Protection
Enhanced Diminishing Manufacturing Sources
(DMS) Support
PWP PACKAGE
(TOP VIEW)
•
•
•
•
•
•
Enhanced Product-Change Notification
GND/HEATSINK
GND/HEATSINK
NC
NC
GND
NC
NC
NC
NC
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
(1)
Qualification Pedigree
NC
IN
IN
EN
PG
1.5 A Low Dropout Voltage Regulator
Available in 2.5 V Fixed Output
Open Drain Power Good (PG) Status Output
Ultra Low 75 μA Typical Quiescent Current
FB/SENSE
OUTPUT
OUTPUT
GND/HEATSINK
(1) Component qualification in accordance with JEDEC and
industry standards to ensure reliable operation over an
extended temperature range. This includes, but is not limited
to, Highly Accelerated Stress Test (HAST) or biased 85/85,
temperature cycle, autoclave or unbiased HAST,
NC
GND/HEATSINK
electromigration, bond intermetallic life, and mold compound
life. Such qualification testing should not be viewed as
justifying use of this component beyond specified
performance and environmental limits.
NC − No internal connection
XXX
DESCRIPTION/ORDERING INFORMATION
TPS75125-EP is a low-dropout regulator with a power good (PG) function. Quiescent current is 75 μA at full load
and drops down to 1 μA when the device is disabled. TPS75125-EP is designed to have fast transient response
for larger load current changes.
Because the PMOS device behaves as a low-value resistor, the dropout voltage is very low and is directly
proportional to the output current. Additionally, since the PMOS pass element is a voltage-driven device, the
quiescent current is very low and independent of output loading (typically 75 μA over the full range of output
current, 1 mA to 1.5 A). These two key specifications yield a significant improvement in operating life for
battery-powered systems.
The device is enabled when the enable (EN) input is connected to a low-level voltage. This low dropout (LDO)
device also features a sleep mode; applying a TTL high signal to EN shuts down the regulator, reducing the
quiescent current to less than 1 μA at TJ = 25°C.
The TPS75125-EP power good (PG) terminal is an active-high, open-drain output that can be used to implement
a power-on reset or a low-battery indicator.
The TPS75125-EP is offered in a 2.5 V fixed-voltage version. Output voltage tolerance is specified as a
maximum of 3% over line, load, and temperature ranges. The TPS75125-EP is available in a 20-pin TSSOP
(PWP) package.
ORDERING INFORMATION(1)
TA
PACKAGE(2)
TSSOP – PWP
ORDERABLE PART NUMBER
TOP-SIDE MARKING
75125MEP
–55°C to 125°C
TPS75125MPWPREP
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
(2) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Copyright © 2006–2007, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
TPS75125-EP
FAST TRANSIENT RESPONSE 15-A LOW DROPOUT VOLTAGE REGULATOR
WITH POWER GOOD
SGLS330B–MAY 2006–REVISED JUNE 2007
www.ti.com
3
4
6
7
8
9
PG or
RESET
V
IN
IN
PG
I
SENSE
OUT
V
O
5
0.22 µF
EN
OUT
†
C
O
+
47 µF
GND
17
†
See application information section for capacitor selection details.
Figure 1. Typical Application Configuration (for Fixed-Output Option)
FUNCTIONAL BLOCK DIAGRAM — ADJUSTABLE VERSION
IN
EN
PG
_
+
OUT
+
_
R1
V
ref
= 1.1834 V
FB
R2
GND
External to the Device
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TPS75125-EP
FAST TRANSIENT RESPONSE 15-A LOW DROPOUT VOLTAGE REGULATOR
WITH POWER GOOD
SGLS330B–MAY 2006–REVISED JUNE 2007
www.ti.com
FUNCTIONAL BLOCK DIAGRAM — FIXED-VOLTAGE VERSION
IN
EN
PG
_
+
OUT
SENSE
+
R1
R2
_
V
ref
= 1.1834 V
GND
TERMINAL FUNCTIONS
TERMINAL
I/O
DESCRIPTION
NAME
NO.
5
EN
I
I
Enable
FB/SENSE
7
Feedback input voltage for adjustable device (sense input for fixed option)
GND
17
Regulator ground
Ground/heatsink
Input voltage
GND/HEATSINK
1, 10, 11, 20
IN
3, 4
I
NC
2, 12–16, 18, 19
No connection
OUTPUT
PG
8, 9
6
O
O
Regulated output voltage
Power good
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TPS75125-EP
FAST TRANSIENT RESPONSE 15-A LOW DROPOUT VOLTAGE REGULATOR
WITH POWER GOOD
SGLS330B–MAY 2006–REVISED JUNE 2007
www.ti.com
PG TIMING DIAGRAM
V
I
V
PG
V
PG
(see Note A)
t
V
O
V
IT+
(see Note B)
V
IT+
(see Note B)
Threshold
Voltage
V
IT−
V
IT−
(see Note B)
(see Note B)
t
PG
Output
Output
Undefined
Output
Undefined
t
NOTES: A.
B.
V
is the minimum input voltage for a valid PG. The symbol V currently is not listed within EIA or JEDEC standards for
PG PG
semiconductorsymbology.
V
IT
− Trip voltage typically is 17% lower than the output voltage (83% V ). V to V is the hysteresis voltage.
O
IT−
IT+
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TPS75125-EP
FAST TRANSIENT RESPONSE 15-A LOW DROPOUT VOLTAGE REGULATOR
WITH POWER GOOD
SGLS330B–MAY 2006–REVISED JUNE 2007
www.ti.com
Absolute Maximum Ratings(1)
over operating junction temperature range (unless otherwise noted)
MIN
–0.3
–0.3
MAX
6
UNIT
VI
Input voltage range(2)
V
V
V
Voltage range at EN
16.5
16.5
Maximum PG voltage
Peak output current
Internally limited
See dissipation rating tables
Continuous total power dissipation
Output voltage
VO
TJ
OUTPUT, FB
5.5
150
150
2
V
Operating virtual junction temperature range
Storage temperature range
ESD rating
–55
–65
°C
°C
kV
Tstg
Human-Body Model
(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating
conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltage values are with respect to network terminal ground.
DISSIPATION RATING TABLE — FREE-AIR TEMPERATURES
AIR FLOW
(CFM)
TA < 25°C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C
TA = 70°C
POWER RATING
TA = 125°C
POWER RATING
PACKAGE
0
2.9 W
4.3 W
3 W
23.5 mW/°C
34.6 mW/°C
23.8 mW/°C
57.9 mW/°C
1.9 W
2.8 W
1.9 W
4.6 W
0.55 W
0.84 W
0.62 W
1.41 W
PWP(1)
300
0
PWP(2)
300
7.2 W
(1) This parameter is measured with the recommended copper heatsink pattern on a one-layer PCB, 5 in × 5 in PCB, 1 oz copper,
2-in × 2-in coverage (4 in2).
(2) This parameter is measured with the recommended copper heatsink pattern on an eight-layer PCB, 1.5 in × 2 in PCB, 1 oz copper with
layers one, two, four, five, seven, and eight at 5% coverage (0.9 in2) and layers three and six at 100% coverage (6 in2). For more
information, refer to TI technical brief SLMA002.
Recommended Operating Conditions
MIN
2.7
1.5
0
MAX UNIT
VI(1)
VO
IO
Input voltage
5.5
5
V
V
Output voltage
Output current
1.5
125
A
TA
Operating ambient temperature
–55
°C
(1) To calculate the minimum input voltage for your maximum output current, use the following equation:
VI min = VO max + VDO max load.
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TPS75125-EP
FAST TRANSIENT RESPONSE 15-A LOW DROPOUT VOLTAGE REGULATOR
WITH POWER GOOD
SGLS330B–MAY 2006–REVISED JUNE 2007
www.ti.com
Electrical Characteristics
over recommended operating ambient temperature range (TA = –55°C to 125°C), VI = VO typ + 1 V, IO = 1 mA, EN = 0 V,
CO = 47 μF (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP MAX UNIT
TJ = 25°C,
3.5 V < VIN < 5.5 V
2.5
Output voltage(1)(2) 2.5-V fixed version
V
2.45
0
2.57
3.5 V < VIN < 5.5 V
5
TJ = 25°C(2)
(2)
75
Quiescent current (GND current)(3)
μA
125
VO + 1 V < VI ≤ 5.5 V,
TJ = 25°C
0.01
%/V
0.14
Output voltage line regulation (ΔVO/VO)(1)(3)
VO + 1 V < VI < 5.5 V
Load regulation(2)(3)
Output noise voltage
1
mV
BW = 300 Hz to 50 kHz,
CO = 100 μF,
VO = 1.5 V,
TJ = 25°C
60
μVrms
Output current limit
VO = 0 V
3.3
150
1
4.5
A
Thermal-shutdown junction temperature
°C
TJ = 25°C
Standby current
EN = VI
μA
10
1
FB input current
FB = 1.5 V
–1
2
μA
V
High-level enable input voltage
Low-level enable input voltage
0.7
V
f = 100 Hz,
TJ = 25°C,
CO = 100 μF,
Power-supply ripple rejection(3)
63
1
dB
V
IO = 1.5 A(1)
Minimum input voltage for valid
PG
IO(PG) = 300 μA,
V(PG) ≤ 0.8 V
1.3
86
Trip threshold voltage
Hysteresis voltage
Output low voltage
Leakage current
VO decreasing
Measured at VO
VI = 2.7 V,
80
%VO
%VO
V
PG
0.5
IO(PG) = 1 mA
0.15
0.4
1
V(PG) = 5.5 V
EN = VI
μA
μA
μA
V
–1
–1
2
1
Input current (EN)
EN = 0 V
0
1
High-level EN input voltage
Low-level EN input voltage
0.7
V
IO = 1.5 A, VI = 3.2 V,
IO = 1.5 A,
TJ = 25°C
160
Dropout voltage (3.3-V output)(4)
mV
VI = 3.2 V
400
(1) Minimum IN operating voltage is 2.7 V or VO typ + 1 V, whichever is greater. Maximum IN voltage 5.5 V.
(2) IO = 1 mA to 1.5 A
(3) If VO ≤ 1.8 V, VI min = 2.7 V, VI max = 5.5 V:
O ǒVI max* 2.7 V
Ǔ
V
ǒ
Ǔ
Line regulation (mV) + %ńV
1000
100
If VO ≥ 2.5 V, VI min = VO + 1 V, VI max = 5.5 V:
ƪVI max * ǒVO ) 1 VǓƫ
V
O
ǒ
Ǔ
Line regulation (mV) + %ńV
1000
100
(4) IN voltage equals VO typ – 100 mV; dropout voltage limited by input voltage range limitations.
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TPS75125-EP
FAST TRANSIENT RESPONSE 15-A LOW DROPOUT VOLTAGE REGULATOR
WITH POWER GOOD
SGLS330B–MAY 2006–REVISED JUNE 2007
www.ti.com
TYPICAL CHARACTERISTICS
Estimated Device Life at Elevated Temperatures Wirebond Voiding Fail Modes
8
7
6
5
4
3
2
1
0
85
95
105
115
125
135
145
Continuous TA (°C)
GROUND CURRENT
vs
JUNCTION TEMPERATURE
INPUT VOLTAGE (MIN)
vs
OUTPUT VOLTAGE
90
4
V = 5 V
I
I
O
= 1.5 A
I
O
= 1.5 A
85
80
75
T
A
= 25°C
T
A
= 125°C
70
65
60
55
50
3
T
= −40°C
A
2.7
2
1.5 1.75
−40
10
60
110
160
2
2.25 2.5 2.75
− Output Voltage − V
3
3.25 3.5
T − Junction Temperature − °C
J
V
O
Figure 2.
Figure 3.
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TPS75125-EP
FAST TRANSIENT RESPONSE 15-A LOW DROPOUT VOLTAGE REGULATOR
WITH POWER GOOD
SGLS330B–MAY 2006–REVISED JUNE 2007
www.ti.com
To Load
IN
V
I
OUT
+
C
O
R
L
EN
GND
ESR
Figure 4. Test Circuit for Typical Regions of Stability (see Figures 5 and 6) (Fixed-Output Option)
TYPICAL REGION OF STABILITY
EQUIVALENT SERIES RESISTANCE
vs
TYPICAL REGION OF STABILITY
EQUIVALENT SERIES RESISTANCE
vs
(1)
(1)
OUTPUT CURRENT
OUTPUT CURRENT
10
10
V
O
= 3.3 V
V
O
= 3.3 V
C
O
= 100 µF
C
O
= 47 µF
V = 4.3 V
I
V = 4.3 V
I
T = 25°C
J
T = 25°C
J
1
1
Region of Stability
Region of Stability
0.1
0.1
0.05
Region of Instability
Region of Instability
0.01
0.01
0
0.5
1
1.5
0
0.5
I − Output Current − A
O
1
1.5
I
O
− Output Current − A
(1) Equivalent series resistance (ESR) refers to
the total series resistance, including the
ESR of the capacitor, any series resistance
added externally, and PWB trace resistance
to CO.
(1) Equivalent series resistance (ESR) refers to
the total series resistance, including the
ESR of the capacitor, any series resistance
added externally, and PWB trace resistance
to CO.
Figure 5.
Figure 6.
8
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TPS75125-EP
FAST TRANSIENT RESPONSE 15-A LOW DROPOUT VOLTAGE REGULATOR
WITH POWER GOOD
SGLS330B–MAY 2006–REVISED JUNE 2007
www.ti.com
APPLICATION INFORMATION
The TPS75125-EP is a fixed-output voltage regulator (2.5 V).
Minimum Load Requirements
The TPS75125-EP is stable, even at no load; no minimum load is required for operation.
Pin Functions
Enable (EN)
The EN terminal is an input that enables or shuts down the device. If EN is a logic high, the device is in
shutdown mode. When EN goes to logic low, the device is enabled.
Power Good (PG)
The PG terminal is an open-drain, active-high output that indicates the status of VO (output of the LDO). When
VO reaches 83% of the regulated voltage, PG goes to a high-impedance state. PG goes to a low-impedance
state when VO falls below 83% (i.e., overload condition) of the regulated voltage. The open-drain output of PG
requires a pullup resistor.
Sense (SENSE)
The SENSE terminal of the fixed-output option must be connected to the regulator output, and the connection
should be as short as possible. Internally, SENSE connects to a high-impedance, wide-bandwidth amplifier
through a resistor-divider network, and noise pickup feeds through to the regulator output. It is essential to route
the SENSE connection in such a way to minimize/avoid noise pickup. Adding RC networks between SENSE and
VO to filter noise is not recommended because it may cause the regulator to oscillate.
Feedback (FB)
FB is an input terminal used for the adjustable-output option and must be connected to an external feedback
resistor divider. The FB connection should be as short as possible. It is essential to route it in such a way to
minimize/avoid noise pickup. Adding RC networks between FB and VO to filter noise is not recommended
because it may cause the regulator to oscillate.
GND/HEATSINK
All GND/HEATSINK terminals are connected directly to the mount pad for thermal-enhanced operation. These
terminals could be connected to GND or left floating.
Input Capacitor
For a typical application, an input bypass capacitor (0.22 μF – 1 μF) is recommended for device stability. This
capacitor should be as close to the input pins as possible. For fast transient condition, where droop at the input
of the LDO may occur due to high in-rush current, it is recommended to place a larger capacitor at the input as
well. The size of this capacitor is dependant on the output current and response time of the main power supply
as well as the distance to the load (LDO).
Output Capacitor
As with most LDO regulators, the TPS75125-EP requires an output capacitor connected between OUT and GND
to stabilize the internal control loop. The minimum recommended capacitance value is 47 μF, and the equivalent
series resistance (ESR) must be between 100 mΩ and 10 Ω. Solid tantalum electrolytic, aluminum electrolytic,
and multilayer ceramic capacitors are all suitable, provided they meet the requirements described in this section.
Larger capacitors provide a wider range of stability and better load transient response.
This information, along with the ESR graphs, is included to assist in selection of suitable capacitance for the
user's application. When necessary to achieve low height requirements, along with high output current and/or
high load capacitance, several higher ESR capacitors can be used in parallel to meet these guidelines.
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FAST TRANSIENT RESPONSE 15-A LOW DROPOUT VOLTAGE REGULATOR
WITH POWER GOOD
SGLS330B–MAY 2006–REVISED JUNE 2007
www.ti.com
APPLICATION INFORMATION (continued)
ESR and Transient Response
LDOs typically require an external output capacitor for stability. In fast transient-response applications,
capacitors are used to support the load current while the LDO amplifier is responding. In most applications, one
capacitor is used to support both functions.
Besides its capacitance, every capacitor also contains parasitic impedances. These parasitic impedances are
resistive as well as inductive. The resistive impedance is called equivalent series resistance (ESR), and the
inductive impedance is called equivalent series inductance (ESL). The equivalent schematic diagram of any
capacitor can, therefore, be drawn as shown in Figure 7.
R
ESR
L
ESL
C
Figure 7. ESR and ESL
In most cases, the effect of inductive impedance ESL can be neglected. Therefore, the following application
focuses mainly on the parasitic-resistance ESR.
Figure 8 shows the output capacitor and its parasitic impedances in a typical LDO output stage.
I
O
LDO
+
R
ESR
V
ESR
−
V
I
V
O
R
LOAD
C
O
Figure 8. LDO Output Stage With Parasitic Resistances ESR and ESL
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FAST TRANSIENT RESPONSE 15-A LOW DROPOUT VOLTAGE REGULATOR
WITH POWER GOOD
SGLS330B–MAY 2006–REVISED JUNE 2007
www.ti.com
APPLICATION INFORMATION (continued)
In steady state (dc state condition), the load current is supplied by the LDO (solid arrow) and the voltage across
the capacitor is the same as the output voltage [V(CO) = VO]. This means no current is flowing into the CO
branch. If IO suddenly increases (transient condition), the following occurs:
•
The LDO is not able to supply the sudden current need due to its response time (t1 in Figure 9). Therefore,
capacitor CO provides the current for the new load condition (dashed arrow). CO now acts like a battery with
an internal resistance, ESR. Depending on the current demand at the output, a voltage drop occurs at RESR
.
This voltage is shown as VESR in Figure 8.
•
When CO is conducting current to the load, initial voltage at the load is VO = V(CO) – VESR. Due to the
discharge of CO, the output voltage VO drops continuously until the response time t1 of the LDO is reached
and the LDO resumes supplying the load. From this point, the output voltage starts rising again until it
reaches the regulated voltage. This period is shown as t2 in Figure 9.
Figure 9 also shows the impact of different ESRs on the output voltage. The left brackets show different levels of
ESRs, where number 1 displays the lowest and number 3 displays the highest ESR.
From the previous description, these conclusions can be drawn:
•
•
The higher the ESR, the larger the droop at the beginning of load transient.
The smaller the output capacitor, the faster the discharge time and the bigger the voltage droop during the
LDO response period.
Conclusion
To minimize the transient output droop, capacitors must have a low ESR and be large enough to support the
minimum output-voltage requirement.
I
O
V
O
1
2
ESR 1
ESR 2
3
ESR 3
t
1
t
2
Figure 9. Correlation of Different ESRs and Their Influence to Regulation of VO
at a Load Step From Low-to-High Output Current
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FAST TRANSIENT RESPONSE 15-A LOW DROPOUT VOLTAGE REGULATOR
WITH POWER GOOD
SGLS330B–MAY 2006–REVISED JUNE 2007
www.ti.com
APPLICATION INFORMATION (continued)
Regulator Protection
The TPS75125-EP PMOS-pass transistor has a built-in back diode that conducts reverse currents when the
input voltage drops below the output voltage (e.g., during power down). Current is conducted from the output to
the input and is not internally limited. When extended reverse voltage is anticipated, external limiting may be
appropriate.
The TPS75125-EP also features internal current limiting and thermal protection. During normal operation, the
device limits output current to approximately 3.3 A. When current limiting engages, the output voltage scales
back linearly until the overcurrent condition ends. While current limiting is designed to prevent gross device
failure, care should be taken not to exceed the power-dissipation ratings of the package. If the temperature of
the device exceeds 150°C (typ), thermal-protection circuitry shuts it down. Once the device has cooled below
130°C (typ), regulator operation resumes.
Power Dissipation and Junction Temperature
Specified regulator operation is assured to a junction temperature of 125°C; the maximum junction temperature
should be restricted to 125°C under normal operating conditions. This restriction limits the power-dissipation the
regulator can handle in any given application. To ensure the junction temperature is within acceptable limits,
calculate the maximum allowable dissipation, PD(max), and the actual dissipation, PD, which must be less than or
equal to PD(max)
.
The maximum power-dissipation limit is determined using the following equation:
T max * T
J
+
A
(1)
P
D(max)
R
qJA
Where:
T max = Maximum allowable junction temperature
J
R
θJA
= Thermal resistance junction-to-ambient for the package, i.e., 34.6°C/W for the 20-terminal
PWP with no airflow (see Table 1)
T = Ambient temperature
A
The regulator dissipation is calculated using:
+ ǒVI * V
Ǔ
P
I
(2)
D
O
O
Power dissipation resulting from quiescent current is negligible. Excessive power dissipation triggers the thermal
protection circuit.
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FAST TRANSIENT RESPONSE 15-A LOW DROPOUT VOLTAGE REGULATOR
WITH POWER GOOD
SGLS330B–MAY 2006–REVISED JUNE 2007
www.ti.com
THERMAL INFORMATION
Thermally-Enhanced TSSOP-20 (PWP – PowerPad™ Package)
The thermally-enhanced PWP package is based on the 20-pin TSSOP, but includes a thermal pad (see
Figure 10c) to provide an effective thermal contact between the IC and the printed wiring board (PWB).
Traditionally, surface mount and power have been mutually-exclusive terms. A variety of scaled-down
TO220-type packages have leads formed as gull wings to make them applicable for surface-mount applications.
These packages, however, suffer from several shortcomings – they do not address the very low profile
requirements (< 2 mm) of many of today's advanced systems, and they do not offer a pin count high enough to
accommodate increasing integration. On the other hand, traditional low-power surface-mount packages require
power-dissipation derating that severely limits the usable range of many high-performance analog circuits.
The PWP package (thermally-enhanced TSSOP) combines fine-pitch surface-mount technology with thermal
performance comparable to much larger power packages.
The PWP package is designed to optimize the heat transfer to the PWB. Because of the very small size and
limited mass of a TSSOP package, thermal enhancement is achieved by improving the thermal-conduction
paths that remove heat from the component. The thermal pad is formed using a lead-frame design (patent
pending) and manufacturing technique to provide the user with direct connection to the heat-generating IC.
When this pad is soldered or otherwise coupled to an external heat dissipator, high power dissipation in the
ultra-thin, fine-pitch, surface-mount package can be reliably achieved.
DIE
Side View (a)
Thermal
Pad
DIE
End View (b)
Bottom View (c)
Figure 10. Views of Thermally-Enhanced PWP Package
Because the conduction path has been enhanced, power-dissipation capability is determined by the thermal
considerations in the PWB design. For example, simply adding a localized copper plane (heatsink surface) that
is coupled to the thermal pad, enables the PWP package to dissipate 2.5 W in free air (reference Figure 12a, 8
cm2 of copper heatsink and natural convection). Increasing the heatsink size increases the power-dissipation
range for the component. The power-dissipation limit can be further improved by adding airflow to a PWB/IC
assembly (see Figure 11 and Figure 12). The line drawn at 0.3 cm2 in Figure 11 and Figure 12 indicates
performance at the minimum recommended heatsink size shown in Figure 14.
The thermal pad is directly connected to the substrate of the IC, which for the TPS75125PWP is a secondary
electrical connection to device ground. The heatsink surface that is added to the PWP can be a ground plane or
be left electrically isolated. In TO220-type surface-mount packages, the thermal connection also is the primary
electrical connection for a given terminal, which is not always ground. The PWP package provides up to 16
independent leads that can be used as inputs and outputs (Note: leads 1, 10, 11, and 20 are connected
internally to the thermal pad and the IC substrate).
13
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TPS75125-EP
FAST TRANSIENT RESPONSE 15-A LOW DROPOUT VOLTAGE REGULATOR
WITH POWER GOOD
SGLS330B–MAY 2006–REVISED JUNE 2007
www.ti.com
THERMAL INFORMATION (continued)
THERMAL RESISTANCE
vs
COPPER HEATSINK AREA
150
125
100
Natural Convection
50 ft/min
100 ft/min
150 ft/min
200 ft/min
75
50
25
250 ft/min
300 ft/min
0 0.3
1
2
3
4
5
6
7
8
2
Copper Heatsink Area − cm
Figure 11.
14
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TPS75125-EP
FAST TRANSIENT RESPONSE 15-A LOW DROPOUT VOLTAGE REGULATOR
WITH POWER GOOD
SGLS330B–MAY 2006–REVISED JUNE 2007
www.ti.com
THERMAL INFORMATION (continued)
3.5
3.5
T = 25°C
A
T = 55°C
A
300 ft/min
3
2.5
2
3
2.5
2
150 ft/min
300 ft/min
150 ft/min
Natural Convection
1.5
1
1.5
Natural Convection
1
0.5
0
0.5
0
0
2
4
6
8
0
2
4
6
8
0.3
0.3
2
2
Copper Heatsink Size − cm
Copper Heatsink Size − cm
(a)
(b)
3.5
T = 105°C
A
3
2.5
2
1.5
1
150 ft/min
300 ft/min
Natural Convection
0.5
0
0
0.3
2
4
6
8
2
Copper Heatsink Size − cm
(c)
Figure 12. PWP Package Power Ratings at Ambient Temperatures of 25°C, 55°C, and 105°C
Figure 13 is an example of a thermally-enhanced PWB layout for use with the PWP package. This board
configuration was used in the thermal experiments that generated the power ratings shown in Figure 11 and
Figure 12. As previously discussed, copper has been added on the PWB to conduct heat away from the device.
RθJA for this assembly is shown in Figure 11 as a function of heatsink area. A family of curves is included to
show the effect of airflow introduced into the system.
15
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TPS75125-EP
FAST TRANSIENT RESPONSE 15-A LOW DROPOUT VOLTAGE REGULATOR
WITH POWER GOOD
SGLS330B–MAY 2006–REVISED JUNE 2007
www.ti.com
THERMAL INFORMATION (continued)
Heatsink Area
1-oz Copper
Board thickness
Board size
Board material
Copper trace/heatsink
62 mils
3.2 in × 3.2 in
FR4
1 oz
Exposed pad mounting 63/67 tin/lead solder
Figure 13. PWB Layout (Including Copper Heatsink Area) for Thermally-Enhanced PWP Package
From Figure 11, RθJA for a PWB assembly can be determined and used to calculate the maximum
power-dissipation limit for the component/PWB assembly, with the equation:
T max * T
J
A
P
+
Ǔ
ǒ
D max
(3)
R
qJA(system)
Where:
TJ max = Maximum specified junction temperature
(150°C absolute maximum limit, 125°C recommended operating limit)
TA = Ambient temperature
For the case where TA = 55°C, airflow = 200 ft/min, copper heatsink area = 4 cm2, the maximum
power-dissipation limit can be calculated. First, from Figure 11, the system RθJA is 50°C/W, therefore, the
maximum power dissipation limit is:
T max * T
°
°
J
A
125 C * 55 C
P
+
+
+ 1.4 W
(4)
D(max)
°
R
50 CńW
qJA(system)
If the system implements a TPS75133QPWP regulator, where VI = 5 V and IO = 800 mA, the internal power
dissipation is:
+ ǒVI * V
Ǔ
P
I + (5 * 3.3) 0.8 + 1.36 W
(5)
D(total)
O
O
Comparing PD(total) with PD(max) reveals that the power dissipation in this example does not exceed the calculated
limit. When it does, one of two corrective actions should be made – raising the power-dissipation limit by
increasing the airflow or the heatsink area, or lowering the internal power dissipation of the regulator by reducing
the input voltage or the load current. In either case, the previous calculations should be repeated with the new
system parameters.
16
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TPS75125-EP
FAST TRANSIENT RESPONSE 15-A LOW DROPOUT VOLTAGE REGULATOR
WITH POWER GOOD
SGLS330B–MAY 2006–REVISED JUNE 2007
www.ti.com
THERMAL INFORMATION (continued)
Mounting Information
The primary requirement is to complete the thermal contact between the thermal pad and the PWB metal. The
thermal pad is a solderable surface and is fully intended to be soldered at the time the component is mounted.
Although voiding in the thermal-pad solder connection is not desirable, up to 50% voiding is acceptable. The
data included in Figure 11 and Figure 12 is for soldered connections with voiding between 20% and 50%. The
thermal analysis shows no significant difference resulting from the variation in voiding percentage.
Figure 14 shows the solder-mask land pattern for the PWP package. The minimum recommended heatsink area
also is shown. This is simply a copper plane under the body extent of the package, including metal routed under
terminals 1, 10, 11, and 20.
Minimum Recommended
Heatsink Area
Location of Exposed
Thermal Pad on
PWP Package
Figure 14. PWP Package Land Pattern
17
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PACKAGE OPTION ADDENDUM
www.ti.com
18-Sep-2008
PACKAGING INFORMATION
Orderable Device
TPS75125MPWPREP
V62/03636-14XE
Status (1)
ACTIVE
ACTIVE
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
Drawing
HTSSOP
PWP
20
2000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
HTSSOP
PWP
20
2000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF TPS75125-EP :
Catalog: TPS75125
•
NOTE: Qualified Version Definitions:
Catalog - TI's standard catalog product
•
Addendum-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
14-Jul-2012
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
B0
K0
P1
W
Pin1
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
TPS75125MPWPREP HTSSOP PWP
20
2000
330.0
16.4
6.95
7.1
1.6
8.0
16.0
Q1
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
14-Jul-2012
*All dimensions are nominal
Device
Package Type Package Drawing Pins
HTSSOP PWP 20
SPQ
Length (mm) Width (mm) Height (mm)
367.0 367.0 38.0
TPS75125MPWPREP
2000
Pack Materials-Page 2
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